Various changes.

Separate a few reusable components from XZ Utils specific
code. The reusable code is now in "tuklib" modules. A few
more could be separated still, e.g. bswap.h.

Fix some bugs in lzmainfo.

Fix physmem and cpucores code on OS/2. Thanks to Elbert Pol
for help.

Add OpenVMS support into physmem. Add a few #ifdefs to ease
building XZ Utils on OpenVMS. Thanks to Jouk Jansen for the
original patch.

5 files changed, 215 insertions, 118 deletions

diff --git a/m4/lc_physmem.m4 b/m4/lc_physmem.m4
deleted file mode 100644
index 5d9581e1..00000000
--- a/m4/lc_physmem.m4
+++ /dev/null
@@ -1,84 +0,0 @@
-dnl ###########################################################################
-dnl
-dnl lc_PHYSMEM - Check how to find out the amount of physical memory
-dnl
-dnl - sysconf() gives all the needed info on GNU+Linux and Solaris.
-dnl - BSDs use sysctl().
-dnl - sysinfo() works on Linux/dietlibc and probably on other Linux systems
-dnl   whose libc may lack sysconf().
-dnl
-dnl ###########################################################################
-dnl
-dnl Author: Lasse Collin
-dnl
-dnl This file has been put into the public domain.
-dnl You can do whatever you want with this file.
-dnl
-dnl ###########################################################################
-AC_DEFUN([lc_PHYSMEM], [
-AC_MSG_CHECKING([how to detect the amount of physical memory])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <unistd.h>
-int
-main(void)
-{
-	long i;
-	i = sysconf(_SC_PAGESIZE);
-	i = sysconf(_SC_PHYS_PAGES);
-	return 0;
-}
-]])], [
-	AC_DEFINE([HAVE_PHYSMEM_SYSCONF], [1],
-		[Define to 1 if the amount of physical memory can be detected
-		with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
-	AC_MSG_RESULT([sysconf])
-], [
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <sys/types.h>
-#ifdef HAVE_SYS_PARAM_H
-#	include <sys/param.h>
-#endif
-#include <sys/sysctl.h>
-int
-main(void)
-{
-	int name[2] = { CTL_HW, HW_PHYSMEM };
-	unsigned long mem;
-	size_t mem_ptr_size = sizeof(mem);
-	sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
-	return 0;
-}
-]])], [
-	AC_DEFINE([HAVE_PHYSMEM_SYSCTL], [1],
-		[Define to 1 if the amount of physical memory can be detected
-		with sysctl().])
-	AC_MSG_RESULT([sysctl])
-], [
-dnl sysinfo() is Linux-specific. Some non-Linux systems have
-dnl incompatible sysinfo() so we must check $host_os.
-case $host_os in
-	linux*)
-		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <sys/sysinfo.h>
-int
-main(void)
-{
-	struct sysinfo si;
-	sysinfo(&si);
-	return 0;
-}
-		]])], [
-			AC_DEFINE([HAVE_PHYSMEM_SYSINFO], [1],
-				[Define to 1 if the amount of physical memory
-				can be detected with Linux sysinfo().])
-			AC_MSG_RESULT([sysinfo])
-		], [
-			AC_MSG_RESULT([unknown])
-		])
-		;;
-	*)
-		AC_MSG_RESULT([unknown])
-		;;
-esac
-])])
-])dnl lc_PHYSMEM
diff --git a/m4/tuklib_common.m4 b/m4/tuklib_common.m4
new file mode 100644
index 00000000..d942a25f
--- /dev/null
+++ b/m4/tuklib_common.m4
@@ -0,0 +1,22 @@
+#
+# SYNOPSIS
+#
+#   TUKLIB_COMMON
+#
+# DESCRIPTION
+#
+#   Common checks for tuklib.
+#
+# COPYING
+#
+#   Author: Lasse Collin
+#
+#   This file has been put into the public domain.
+#   You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_COMMON], [
+AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([AC_PROG_CC_C99])
+AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+])dnl
diff --git a/m4/lc_cpucores.m4 b/m4/tuklib_cpucores.m4
index 52f7c985..9058d445 100644
--- a/m4/lc_cpucores.m4
+++ b/m4/tuklib_cpucores.m4
@@ -1,36 +1,35 @@
-dnl ###########################################################################
-dnl
-dnl lc_CPUCORES - Check how to find out the number of online CPU cores
-dnl
-dnl Check how to find out the number of available CPU cores in the system.
-dnl sysconf(_SC_NPROCESSORS_ONLN) works on most systems, except that BSDs
-dnl use sysctl().
-dnl
-dnl ###########################################################################
-dnl
-dnl Author: Lasse Collin
-dnl
-dnl This file has been put into the public domain.
-dnl You can do whatever you want with this file.
-dnl
-dnl ###########################################################################
-AC_DEFUN([lc_CPUCORES], [
+#
+# SYNOPSIS
+#
+#   TUKLIB_CPUCORES
+#
+# DESCRIPTION
+#
+#   Check how to find out the number of available CPU cores in the system.
+#   This information is used by tuklib_cpucores.c.
+#
+#   Currently this supports sysctl() (BSDs, OS/2) and sysconf() (GNU/Linux,
+#   Solaris, Cygwin).
+#
+# COPYING
+#
+#   Author: Lasse Collin
+#
+#   This file has been put into the public domain.
+#   You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_CPUCORES], [
+AC_REQUIRE([TUKLIB_COMMON])
+
+# sys/param.h might be needed by sys/sysctl.h.
+AC_CHECK_HEADERS([sys/param.h])
+
 AC_MSG_CHECKING([how to detect the number of available CPU cores])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <unistd.h>
-int
-main(void)
-{
-	long i;
-	i = sysconf(_SC_NPROCESSORS_ONLN);
-	return 0;
-}
-]])], [
-	AC_DEFINE([HAVE_CPUCORES_SYSCONF], [1],
-		[Define to 1 if the number of available CPU cores can be
-		detected with sysconf(_SC_NPROCESSORS_ONLN).])
-	AC_MSG_RESULT([sysconf])
-], [
+
+# Look for sysctl() solution first, because on OS/2, both sysconf()
+# and sysctl() pass the tests in this file, but only sysctl()
+# actually works.
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 #include <sys/types.h>
 #ifdef HAVE_SYS_PARAM_H
@@ -47,11 +46,27 @@ main(void)
 	return 0;
 }
 ]])], [
-	AC_DEFINE([HAVE_CPUCORES_SYSCTL], [1],
+	AC_DEFINE([TUKLIB_CPUCORES_SYSCTL], [1],
 		[Define to 1 if the number of available CPU cores can be
 		detected with sysctl().])
 	AC_MSG_RESULT([sysctl])
 ], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int
+main(void)
+{
+	long i;
+	i = sysconf(_SC_NPROCESSORS_ONLN);
+	return 0;
+}
+]])], [
+	AC_DEFINE([TUKLIB_CPUCORES_SYSCONF], [1],
+		[Define to 1 if the number of available CPU cores can be
+		detected with sysconf(_SC_NPROCESSORS_ONLN).])
+	AC_MSG_RESULT([sysconf])
+], [
 	AC_MSG_RESULT([unknown])
 ])])
-])dnl lc_CPUCORES
+])dnl
diff --git a/m4/tuklib_physmem.m4 b/m4/tuklib_physmem.m4
new file mode 100644
index 00000000..91e3dc56
--- /dev/null
+++ b/m4/tuklib_physmem.m4
@@ -0,0 +1,119 @@
+#
+# SYNOPSIS
+#
+#   TUKLIB_PHYSMEM
+#
+# DESCRIPTION
+#
+#   Check how to get the amount of physical memory.
+#   This information is used in tuklib_physmem.c.
+#
+#   Supported methods:
+#
+#     - Windows (including Cygwin), OS/2, DJGPP (DOS), and OpenVMS have
+#       operating-system specific functions.
+#
+#     - sysconf() works on GNU/Linux and Solaris, and possibly on
+#       some BSDs.
+#
+#     - BSDs use sysctl().
+#
+#     - sysinfo() works on Linux/dietlibc and probably on other Linux
+#       systems whose libc may lack sysconf().
+#
+# COPYING
+#
+#   Author: Lasse Collin
+#
+#   This file has been put into the public domain.
+#   You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [
+AC_REQUIRE([TUKLIB_COMMON])
+
+# sys/param.h might be needed by sys/sysctl.h.
+AC_CHECK_HEADERS([sys/param.h])
+
+AC_MSG_CHECKING([how to detect the amount of physical memory])
+
+# Maybe checking $host_os would be enough but this matches what
+# tuklib_physmem.c does.
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
+		|| defined(__DJGPP__) || defined(__VMS)
+int main(void) { return 0; }
+#else
+#error
+#endif
+]])], [
+	AC_MSG_RESULT([special])
+], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int
+main(void)
+{
+	long i;
+	i = sysconf(_SC_PAGESIZE);
+	i = sysconf(_SC_PHYS_PAGES);
+	return 0;
+}
+]])], [
+	AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
+	AC_MSG_RESULT([sysconf])
+], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/types.h>
+#ifdef HAVE_SYS_PARAM_H
+#	include <sys/param.h>
+#endif
+#include <sys/sysctl.h>
+int
+main(void)
+{
+	int name[2] = { CTL_HW, HW_PHYSMEM };
+	unsigned long mem;
+	size_t mem_ptr_size = sizeof(mem);
+	sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
+	return 0;
+}
+]])], [
+	AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysctl().])
+	AC_MSG_RESULT([sysctl])
+], [
+
+# This version of sysinfo() is Linux-specific. Some non-Linux systems have
+# different sysinfo() so we must check $host_os.
+case $host_os in
+	linux*)
+		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/sysinfo.h>
+int
+main(void)
+{
+	struct sysinfo si;
+	sysinfo(&si);
+	return 0;
+}
+		]])], [
+			AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1],
+				[Define to 1 if the amount of physical memory
+				can be detected with Linux sysinfo().])
+			AC_MSG_RESULT([sysinfo])
+		], [
+			AC_MSG_RESULT([unknown])
+		])
+		;;
+	*)
+		AC_MSG_RESULT([unknown])
+		;;
+esac
+])])])
+])dnl
diff --git a/m4/tuklib_progname.m4 b/m4/tuklib_progname.m4
new file mode 100644
index 00000000..f3e158bd
--- /dev/null
+++ b/m4/tuklib_progname.m4
@@ -0,0 +1,25 @@
+#
+# SYNOPSIS
+#
+#   TUKLIB_PROGNAME
+#
+# DESCRIPTION
+#
+#   Put argv[0] into a global variable progname. On DOS-like systems,
+#   modify it so that it looks nice (no full path or .exe suffix).
+#
+#   This .m4 file is needed allow this module to use glibc's
+#   program_invocation_name.
+#
+# COPYING
+#
+#   Author: Lasse Collin
+#
+#   This file has been put into the public domain.
+#   You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_PROGNAME], [
+AC_REQUIRE([TUKLIB_COMMON])
+AC_CHECK_DECLS([program_invocation_name], [], [], [#include <errno.h>])
+])dnl